The I finally have a PlayStation2 at home. Now it is time to start looking for tools for game developing for it.
The first place google has shown was http://ps2dev.org/. The first look has been promising. Besides the PlayStation2 related pages, it also has tutorials and articles related to the PlayStation3 and the PSP.
I hope to sooner be posting something about my experiences developing for the PlayStation2.
The results should probably be tested with some PlayStation2 emulator (http://pcsx2.net/, http://www.emulator-zone.com/doc.php/ps2/)